研究生: |
陳建守 Jian-Shou Chen |
---|---|
論文名稱: |
半批式ST/2-EHA乳化聚合反應:界面活性劑與單體極性之效應 Semibatch ST/2-EHA Emulsion polymerization : The Effect of Surfactants and Monomer polarity |
指導教授: |
陳崇賢
Chorng-Shyan Chern |
口試委員: |
林析右
Shi-Yow Lin 許榮木 Rong-Mu Xu |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2011 |
畢業學年度: | 99 |
語文別: | 中文 |
論文頁數: | 78 |
中文關鍵詞: | 半批式乳化聚合 、界面活性劑 、苯乙烯 、丙烯酸2-乙基己酯 、甲基丙烯酸甲酯 |
外文關鍵詞: | Semibatch Emulsion polymerization, Surfactant, Styrene, 2-Ethylhexyl acrylate, Methyl methacrylate |
相關次數: | 點閱:225 下載:1 |
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本論文主要是探討半批式ST/2-EHA與MMA/2-EHA乳化聚合反應中乳漿粒子大小的變化與安定性的問題,並且以單體極性與混合型界面活性劑來討論其對所合成粒子的相關效應。在單體極性方面,親水性依序為MMA>ST>2-EHA,由實驗結果得知其粒徑大小依序2-EHA、ST、MMA,在共聚合方面其粒徑大小為ST/2-EHA大於MMA/2-EHA,這表示著單體極性亦會影響著乳漿粒子粒徑。界面活性劑在粒子成核時期的濃度扮演著非常重要的角色,並且也是決定粒子粒徑大小與分佈的重要變數。實驗結果顯示,ST/2-EHA共聚合系統中,在起始反應器中高分子型乳化劑(B-2)的濃度是影響粒子粒徑最大的變因,而單體進料中非離子界面活性劑(#5090)的影響並沒有那麼顯著。
關於乳漿粒子安定性方面,實驗數據顯示ST/2-EHA與MMA/2-EHA共聚合系統中其濾渣百分比相當的低,表示此系統下的粒子是相當安定,但是在低濃度下的B-2與#5090,粒子所吸附的界面活性劑濃度不足,使得乳化聚合系統中黏度急遽的上升,進而產生凝聚的現象,大大的增加實驗上處理困難。
This study investigates latex particle size control and colloid stabi
-lity for semi-batch styrene/2-ethylhexyl acrylate emulsion polymerizati
-on. The effects of the the hydrophilic property of monomer emulsion feed and the mixed poly -mer/nonionic (B-2/#5090) surfactants are investigated.
Experimental data show that increasing monomer hydrophilicity results in a decreasing the particle size (Monomer hydrophilic ability, MMA>ST>2-EHA). In the semi-batch emulsion copolymerization, styrene/2-ethylhexyl acrylate system shows bigger particle sizes than methyl methacrylate/2-ethylhexyl acrylate system. The concentration of surfactant during the particle nucleation period plays a very important role. The result shows that the particle size decreases with increasing the concentration of surfactants. However, changing the concentration of non-ionic surfactants (#5090) do not change the particle size significantly. The concentration of polymeric surfactant (B-2) is the most important parameter in the semi-batch styrene/2-ethylhexyl acrylate emulsion polymerization.
In the semi-batch emulsion copolymerization, styrene/2-ethylhexyl acrylate system and methyl methacrylate/2-ethyl -hexyl acrylate system are very stable, as show by the very small amount of scrap. Moreover, the surface of colloidal particles absorbs surfactant (B-2/#5090) is not enough; it will lead to reduce colloidal stability.
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